<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style type="text/css">
        .container .cart {
            width: 300px;
            /*background-color: lightgreen;*/
            margin: auto;
        }

        .container .title {
            background-color: lightblue;
            height: 40px;
            line-height: 40px;
            text-align: center;
            /*color: #fff;*/
        }

        .container .total {
            background-color: #FFCE46;
            height: 50px;
            line-height: 50px;
            text-align: right;
        }

        .container .total button {
            margin: 0 10px;
            background-color: #DC4C40;
            height: 35px;
            width: 80px;
            border: 0;
        }

        .container .total span {
            color: red;
            font-weight: bold;
        }

        .container .item {
            height: 55px;
            line-height: 55px;
            position: relative;
            border-top: 1px solid #ADD8E6;
        }

        .container .item img {
            width: 45px;
            height: 45px;
            margin: 5px;
        }

        .container .item .name {
            position: absolute;
            width: 90px;
            top: 0;
            left: 55px;
            font-size: 16px;
        }

        .container .item .change {
            width: 100px;
            position: absolute;
            top: 0;
            right: 50px;
        }

        .container .item .change a {
            font-size: 20px;
            width: 30px;
            text-decoration: none;
            background-color: lightgray;
            vertical-align: middle;
        }

        .container .item .change .num {
            width: 40px;
            height: 25px;
        }

        .container .item .del {
            position: absolute;
            top: 0;
            right: 0px;
            width: 40px;
            text-align: center;
            font-size: 40px;
            cursor: pointer;
            color: red;
        }

        .container .item .del:hover {
            background-color: orange;
        }
    </style>
</head>

<body>
    <div id="app">
        <div class="container">
            <div class="cart">
                <my-cart></my-cart>
            </div>
        </div>
    </div>
    <script type="text/javascript" src="js/vue.js"></script>
    <script type="text/javascript">
        //     需求(步骤):
        // 1.用父子组件搭建页面结构; 
        // 2.头部"我的"改为动态的数据姓名;根据后台list数据渲染到list页面  
        // 3.删除按钮,子组件触发删除事件,通过$emit传递到父组件进行删除操作;  
        // 4.合计金额;数量输入框的值改变总计价格改变;加减按钮之后总价也跟着改变; (子组件给父组件传值)
        var cartTitle = {
            props: ['uname'],
            template: `
        <div class="title">{{uname}}的商品</div>
        `
        }

        var cartList = {
            props: ['list'],
            template: `
        <div>
          <div class="item" v-for='(item,i) in list'>
            <img :src="item.img"/>
            <div class="name">{{item.name}}</div>
            <div class="change">
              <a href="" @click.prevent='sub(i)'>－</a>
              <input type="text" class="num" :value='item.num' @blur='changenum(i,$event)'/>
              <a href="" @click.prevent='add(i)'>＋</a>
            </div>
            <div class="del" @click='$emit("delOpt",i)'>×</div>
          </div>
        </div>
        `,
            methods: {
                // 输入框值改变
                changenum(i, e) {
                    // console.log(i);
                    // console.log(e.target.value-0);
                    this.$emit('changenum', {
                        type: 0,
                        i,
                        v: e.target.value - 0
                    })
                },
                // 加号按钮
                add(i) {                    
                    this.$emit('changenum', {
                        type: 1,
                        i
                    })
                },
                // 减号按钮
                sub(i) {
                    this.$emit('changenum', {
                        type: -1,
                        i
                    })
                }
            }
        }
        var cartBoot = {
            props: ['list'],
            template: `
        <div class="total">
          <span>总价：{{total}}</span>
          <button>结算</button>
        </div>
        `,
            computed: {
                total() {
                    var t = 0;
                    this.list.forEach(item => {
                        t += item.num * item.price;
                    });
                    return t;
                }
            }
        }
        Vue.component('my-cart', {
            data: function () {
                return {
                    uname: 'Mark',
                    list: [{
                        id: 1,
                        name: 'TCL彩电',
                        price: 1000,
                        num: 1,
                        img: 'img/a.jpg'
                    }, {
                        id: 2,
                        name: '机顶盒',
                        price: 1000,
                        num: 1,
                        img: 'img/b.jpg'
                    }, {
                        id: 3,
                        name: '海尔冰箱',
                        price: 1000,
                        num: 1,
                        img: 'img/c.jpg'
                    }, {
                        id: 4,
                        name: '小米手机',
                        price: 1000,
                        num: 1,
                        img: 'img/d.jpg'
                    }, {
                        id: 5,
                        name: 'PPTV电视',
                        price: 1000,
                        num: 2,
                        img: 'img/e.jpg'
                    }]
                }
            },
            template: `
       <div>
            <cart-title :uname='uname'></cart-title>
            <cart-list :list='list' @changenum='changenum' @delOpt='delOpt'></cart-list>
            <cart-boot :list='list'></cart-boot>
       </div>
        `,
            components: {
                'cart-title': cartTitle,
                'cart-list': cartList,
                'cart-boot': cartBoot,
            },
            methods: {
                delOpt(i) {
                    this.list.splice(i, 1);
                },
                changenum(obj) {
                    if (obj.type === 0) {
                        // 输入数量
                        this.list[obj.i].num = obj.v;
                    } else if (obj.type === 1) {
                        // 加号按钮
                        this.list[obj.i].num++;
                    } else if (obj.type === -1) {
                        //减号按钮
                        if (this.list[obj.i].num > 0) {
                            this.list[obj.i].num--;
                        }
                    }
                }
            }
        });
        var vm = new Vue({
            el: '#app',
            data: {

            }
        });
    </script>
</body>

</html>